From WordNet (r) 3.0 (2006):
bean
n 1: any of various edible seeds of plants of the family
Leguminosae used for food [syn: bean, edible bean]
2: any of various seeds or fruits that are beans or resemble
beans
3: any of various leguminous plants grown for their edible seeds
and pods [syn: bean, bean plant]
4: informal terms for a human head [syn: attic, bean,
bonce, noodle, noggin, dome]
v 1: hit on the head, especially with a pitched baseball